采用铝连续挤压包覆法用SWRS72A钢和SWRS82B钢分别制备了LB27和LB20铝包钢芯线，制备冷拔前后的试样并对其进行了室温拉伸试验，研究了试样的拉伸性能和拉伸断口形貌。结果表明：未包覆铝SWRS72A钢的屈服强度和抗拉强度均高于包覆铝后冷拔前的；和未包覆铝SWRS72A钢相比，LB27铝包钢芯线的屈服强度更高，但抗拉强度稍有下降，延伸率显著下降；随着外径的增加，LB20铝包钢芯线屈服强度逐渐减小，其屈服强度均大于LB27铝包钢芯线的；LB20铝包钢芯线的断口形貌和LB27铝包钢芯线相似，但其钢丝边部存在剪切唇。

LB27 and LB20 aluminum-clad steel wires were prepared by continuous extrusion cladding of aluminum with SWRS72A steel and SWRS82B steel, respectively. Samples before and after cold drawing were prepared and tensile experiments were conducted on them at room temperature. The tensile properties and fracture morphology of the samples were studied. The results show that the yield strength and tensile strength of the SWRS72A steel without aluminum cladding were higher than those with aluminum cladding before cold drawing. Compared with SWRS72A steel without aluminum cladding, the yield strength of the LB27 aluminum-clad steel wire was higher, but the tensile strength decreased slightly. The elongation of the LB27 aluminum-clad steel wire decreased significantly. With the increase of outer diameter, the yield strength of the LB20 aluminum-clad steel wire decreased gradually, but was greater than that of the LB27 aluminum-clad steel wire. The fracture morphology of the LB20 aluminum-clad steel wire was similar to that of the LB27 aluminum-clad steel wire, but shear lip existed at the edge of the steel of the LB20 aluminum-clad steel wire.